Lero is a typical open pit mine with the ore treated via conventional agitated leaching with the final product being a gold dore. In 2015 the operation produced 214koz of gold, marginally up on the 205koz achieved in 2015. More importantly all-in-sustaining costs fell from US$1,133/oz to US$832/oz over the same period. The fall was due to improved operational efficiencies in mining and processing. The decline in the price of spare parts along with reduced energy costs also contributed to the fall in costs.